<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        h2{
            text-shadow:3px 3px 3px rgba(0,0,0,0.3)
        }
    </style>
</head>
<body>
<h2>我是一个大标题</h2>
</body>
</html>